[bug] Playwright fixes (#9933)

* Fixes for playwright testing

- Ensure cookies are completely cleaned  between sessions
- Fix base URL based on vite command
- Fix samesite cookie mode
- Prevent /static/ files being served by web server on :8000

* Remove gunicorn option

* Readjust base URL

* Simplify doCachedLogin

* Fix logic func

* Revert webserver cmd

* Set base URL in playwrightconfig file

* Fix URL checks

* Fix URL definitions

* adjust playwright base URL

* Tweak for URL helper

* Further login tweaks

* Tweak test

* wait for API before starting tests

* Handle error

* Adjust login functions

* Don't use gunicorn

- But still use the webserver to serve static files in CI

* Enhanced login functions

* Tweak login tests

* Fix broken test

* Flipped the flippies

src/frontend/vite.config.ts

@@ -21,6 +21,10 @@ const OUTPUT_DIR = '../../src/backend/InvenTree/web/static/web';
 
 // https://vitejs.dev/config/
 export default defineConfig(({ command, mode }) => {
+  // In 'build' mode, we want to use an empty base URL (for static file generation)
+  const baseUrl: string | undefined = command === 'build' ? '' : undefined;
+  console.log(`Running Vite in '${command}' mode -> base URL: ${baseUrl}`);
+
   return {
     plugins: [
       react({
@@ -57,7 +61,7 @@ export default defineConfig(({ command, mode }) => {
     ],
     // When building, set the base path to an empty string
     // This is required to ensure that the static path prefix is observed
-    base: command == 'build' ? '' : undefined,
+    base: baseUrl,
     build: {
       manifest: true,
       outDir: OUTPUT_DIR,